Air cylinder



FIG. 1 is a front elevational view of an air cylinder showing my new design;

FIG. 2 is a top plan view, the opposite side view being a mirror image;

FIG. 3 is a right side elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a sectional view taken along the lines 5--5 of FIG. 3; and,

FIG. 6 is a perspective view. 

The ornamental design for an air cylinder, as shown. 